I totally agree with you Shift. Surrey is way better in terms of it's "urbaness" compared to Mississauga, despite it having more high rise residential and office buildings. Heck from the Google Maps satellite images you posted, even the out lying "suburban" parts of the area are more dense in Surrey.
Honestly a lot of those high rises in Mississauga are just corporate offices with huge surface parking lots and lots of empty space. Residential towers there are also set back far from the streets. It kinda gives me the feel of Annacis Island and not an urban centre. King George Boulevard does look good in comparison.
Just take a look at this video driving through "Downtown Mississauga"
https://youtu.be/6Rrb0h-n2xk
Anyways, I sure hope The Hub at King George Stations gets built ASAP

And even though PA and PP has so much low density land surrounding it, within the development it self it looks incredibly dense. It's also right beside rapid transit too!